Enhanced high-dispersion coronagraphy with KPIC phase II: design, assembly and status of sub-modules
Enhanced high-dispersion coronagraphy with KPIC phase II: design, assembly and status of sub-modules
复制标题
KPIC 二期增强型高色散日冕术：子模块的设计、组装和状态
DOI：
10.1117/12.2563107
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
R. Jensen
中科院分区：
文献类型：
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作者：
N. Jovanovic;B. Calvin;Michael E. Porter;T. Schofield;Jason J. Wang;Mitsuko K. Roberts;G. Ruane;J. Wallace;R. Bartos;J. Pezzato;Jennah K. Colborn;J. Delorme;J. Delorme;D. Echeverri;D. Mawet;D. Mawet;C. Bond;S. Cetre;S. Lilley;S. Ragland;P. Wizinowich;R. Jensen
凯克行星成像仪和表征仪（KPIC）是一种专门用于凯克K和L波段高色散日冕测量的仪器。该仪器将提供已知的直接成像的系外行星和北方半球可见的低质量褐矮星伴星的第一个高分辨率（R> 30，000）光谱。
KPIC分阶段开发。第一阶段目前处于早期运营阶段，第二阶段升级将于2021年底部署。第二阶段的目标是最大限度地提高行星光的吞吐量，并最大限度地减少恒星泄漏，从而减少获取具有给定信噪比的光谱所需的曝光时间。为了实现这一目标，KPIC第二阶段利用了几种以前从未以这种方式结合的创新技术。这些包括用于波前校正和散斑控制的1000元件可变形反射镜，一组无损光束成形光学器件以最大化耦合到光纤中，光瞳切趾器以抑制不需要的星光，光瞳平面涡旋掩模以使光谱的采集处于衍射极限和衍射极限内，以及大气色散补偿器。这些模块与第一阶段中的有源光纤注入单元相结合，将成为一个高效的系外行星表征平台。
在本文中，我们将介绍光学和光学机械的最终设计，并强调我们实施的一些创新解决方案，以促进所有新功能。我们将提供子模块的组装和实验室测试的概述以及一些结果。最后，我们将概述部署时间轴。
The Keck Planet Imager and Characterizer (KPIC) is a purpose-built instrument for high-dispersion coronagraphy in the K and L bands on Keck. This instrument will provide the first high resolution (R>30,000) spectra of known directly imaged exoplanets and low-mass brown dwarf companions visible in the northern hemisphere.
KPIC is developed in phases. Phase I is currently at Keck in the early operations stage, and the phase II upgrade will deploy in late 2021. The goal of phase II is to maximize the throughput for planet light and minimize the stellar leakage, hence reducing the exposure time needed to acquire spectra with a given signal-to- noise ratio. To achieve this, KPIC phase II exploits several innovative technologies that have not been combined this way before. These include a 1000-element deformable mirror for wavefront correction and speckle control, a set of lossless beam shaping optics to maximize coupling into the fiber, a pupil apodizer to suppress unwanted starlight, a pupil plane vortex mask to enable the acquisition of spectra at and within the diffraction limit, and an atmospheric dispersion compensator. These modules, when combined with the active fiber injection unit present in phase I, will make for a highly efficient exoplanet characterization platform.
In this paper, we will present the final design of the optics and opto-mechanics and highlight some innovative solutions we implemented to facilitate all the new capabilities. We will provide an overview of the assembly and laboratory testing of the sub-modules and some of the results. Finally, we will outline the deployment timeline.